OPTO 22 Modular M4RTU, User Manual

Page: 63 / 100

M4RTU/M4 I/O User’s Guide 63
FIELD WIRING
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FIELD WIRING TERMINALS
The M4RTU/M4 I/O and M4RTUX field wiring terminals are located at the top of each unit, next to their
corresponding digital and analog channel locations. Together, the M4RTU/M4 I/O and M4RTUX represent a full
complement of 16 digital and 8 analog channels, equivalent to the number of channels on a standard
set of one
digital and one analog brick. (Although the M4RTU/M4 I/O electronics can support a full complement of digital
and analog channels, the unit does not have enough space to support these channels, hence the need for the
M4RTUX I/O Extender.)
Note that although the I/O channels on the M4RTU/M4 I/O and the M4RTUX are labeled identically, these
channels actually represent different modules logically. Hence, on the M4RTU/M4 I/O, the digital channels
labeled 0–7 and the analog channels labeled 0–3 correspond correctly to digital modules 0–7 and analog
modules 0–3, while on the M4RTUX, the channels with the same labels correspond logically to digital modules
8–15 and analog modules 4–7.
Each digital channel has two terminals and each analog channel has four terminals. As with the I/O channels
themselves, the terminals corresponding to these channels are also labeled identically on the M4RTU/M4 I/O
and M4RTUX, even though they represent different terminal connections. Hence, on the M4RTU/M4 I/O, the
terminals labeled 1–16 correspond correctly to terminal connections 1–16, while on the M4RTUX, these terminals
correspond logically to terminal connections 17–32.
Figures 5-1 and Figure 5-2 show the location of the digital and analog channels, as well as their corresponding
terminals for both the M4RTU/M4 I/O and M4RTUX. See also Appendix F for field wiring worksheets.
For additional wiring and module specification information, refer to the
Mistic 200 Systems Installation Guide
and the Mistic 200 Family Data Book .